It's a weird experience for sure and what you're feeling is entirely understandable. From my point of view, it was quite an enlightening experience as I left a job of 11 years to come to NZ. I had worked with the same team of poeple for those 11 years and we got on OK. When they learned I was leaving, suddenly my colleagues turned into some of the best friends I've ever had - everyine was really supprotive and we keep in touch be email and Facebook.
Don't doubt what you're doing, give it a go and keep an open mind. New Zealand is different to what I expected it to be but it's 99% BETTER different ! Good luck !